21543264507 has 8 divisors (see below), whose sum is σ = 28884824640. Its totient is φ = 14281940360.

The previous prime is 21543264503. The next prime is 21543264553. The reversal of 21543264507 is 70546234512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21543264507 - 2² = 21543264503 is a prime.

It is a super-2 number, since 2×21543264507² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21543264503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20058369 + ... + 20059442.

It is an arithmetic number, because the mean of its divisors is an integer number (3610603080).

Almost surely, 2^21543264507 is an apocalyptic number.

21543264507 is a deficient number, since it is larger than the sum of its proper divisors (7341560133).

21543264507 is a wasteful number, since it uses less digits than its factorization.

21543264507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40117993.

The product of its (nonzero) digits is 201600, while the sum is 39.

The spelling of 21543264507 in words is "twenty-one billion, five hundred forty-three million, two hundred sixty-four thousand, five hundred seven".